Upgrading to PHP 5.3.0 LS 4.0.10 Previous Configuration

When compiling PHP 5.3.0 on LS Enterprise 4.0.10 my "Use Configuration From Previous Build" button is greyed out. I have relied on this for all of my past PHP compilations. Is this due to the 4.0.10 upgrade? Is there a log or configuration file available where i can find previous PHP build parameters?

I tried this and it just returns the PHP info which would be time consuming to go back and reconstruct into build flags.

I was able to find my previous build settings in lsws/phpbuild/savedconfig.txt

I have not yet recompiled but wanted to check if lsws will save configuration information going forward? Prior to 4.10 it carried over all PHP Build configuration automatically which made upgrading very painless.